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<br />'8~u324 <br />'" . . The Resident Power and Reservoir System Model (PRSYM) <br /> <br />As a schedulinl! and forecastin~ tool, PRSYM would be used to develop a reservoir system <br />schedule, or operating plan, for the near term (1 to 14 days) and on a seasonal basis (14 days <br />to 6 months) starting from current (real-time) status and operating conditions. To support <br />these functions, PRSYM would be used to: <br /> <br />. Provide a 'first cut' operationally acceptable reservoir schedule based on known <br />and/or anticipated inflow, reservoir, and power system conditions. In this context, <br />the model would also be used to: <br /> <br />. Evaluate the impacts of alternative operating strategies on multi-objective uses <br />and power system costs. <br />. Evaluate the impacts of alternative inflow sequences on operating plans and <br />multi-objective uses. <br />. Adapt the reservoir system schedule to changes in input parameters and/or <br />operating conditions. <br /> <br />PRSYM must also be capable of supporting reservoir system Dlannin~ functions, for both <br />operational planning and policy study purposes. The model would be used on a multi-year <br />time horizon to: <br /> <br />. Evaluate the effects of changes in policy, system constraints, operating conditions, <br />or hydrologic conditions on multipurpose reservoir uses. <br />· Evaluate the impacts of alternative hydro maintenance schedules on reservoir <br />operations. <br /> <br />To accomplish these modeling objectives, PRSYM initially will require a simulation module. <br />It is anticipated that optimization capabilities will also be needed. PRSYM will be designed <br />to incorporate an oDtimization module at a future date (see Section 8, Future Developments). <br /> <br />Functional Requirements of the Simulation Module <br /> <br />The simulation module of PRSYM must be capable of simulating the behavior of a large, <br />complex, multipurpose reservoir system subject to system constraints and objectives. <br />Specifically, the module must generate reservoir releases, elevations, hydro plant generation <br />and generating capacity, turbine discharge capacity, and spill for given operating policy, <br />physical and operational constraints, and inflow. When required, the module must also be <br />capable of providing flow, stage, and selected water quality parameters at specified locations <br />under unsteady flow conditions. The model must provide capabilities for variable time (i.e., <br />include a graduated time step approach) and spatial (i.e., allow for sub-system analysis) <br />resolution. The model must also include a procedure for estimating the value of water in <br />storage for multipurpose uses, including the value of hydropower over time in relationship to <br />the overall power system. <br /> <br />3-2 <br /> <br />. <br /> <br />. <br />